Locomotive-throttle mechanism



Dec. 10, 1929. w. L. REID LOCOMOTIVE THROTTLE MECHANISM Filed June 18, 1925 2 Sheets-Sheet l ATTORNEYJ' Dec. 10, 1929. w. L. REID ,7

LOGOMOTIVE THROTTLE MECHANISM Filed June 18, 1925 2 Sheets-Sheet 2 W ac {NVENIIOR BY W'F W ATTORNEY! 'tory machining of the interior bee?" Patented Dec. 19, 1929 earner WILLIAM L. REID, OF LIMA, OHIO LOCOMOTIVE-THROTTLE MECHANISM Application filed June 18, 1925. Serial No. 37,905.

The object of the present invention is the provision of an improvement in throttle valve mechanism for locomotives which will ensure a better fitting valve and one which can be applied and machined with greater facility and the pa ts of which can be arranged in assembled position betore mountin place in the main throttle casting.

A further object or the invention is the pro vision in a device of the character specified of an arrangement which will permit the use of means that will ensure a more satisfacor the main throttle casting itself particularly the employment of a larger boring bar *hich will not spring and produce inaccurate results.

In order that my invention may be better understood, I will proceed to describe the same in connection with the accompanying drawings, 1n which Fig. 1 is a sectional view of a throttle valve mechanism embodying my invention designed particularly for use in connection with the steam dome onthe engine.

Fig. 2 is a side elevation of the device shown in Fig. 1.

Fi 3 is a vertical section through an- 23 other arrangement designed for use 1n the steam dome of the locomotive, the parts of the main throttle casting being somewhat altered from the form shown in Figs. 1 and 2.

Fig. 1 is a transverse sectional view on the line 1-1 oi Fig. 8.

Referringnow more particularly to Fig. 1 it will be seen that I have therein indicated a main throttle casting 1 having the outlet connection at 2 and an upper inturned flange at 3 which contains opening through which there is placed a depending cage 1 that carries in its lower por ion a cylindrical bearing 5 for receiving the balancing piston 6.

The lower end of the cage 1 is made with a stem 7 fitting into a bridge 8 formed integral with the main throttle casting 1.

Fitted within the opening at the top'of the cage 1 is a seat ring 9 on which rests the valve 10 the diameter of the seat of which is seri s of bolts 18 that fasten thecage' down position upon the main throttle casting k 01" the flange 17 and the upper surface 0; he throttle casting 1 ust surrounding the aperture within which the cage 1 rests.

' In operation thepilot valve11 is first opened which admits steam that surrounds the upper portion of the valve 10, downward through the central passage and around the stem 12 into the balancing chamber 6 below thebalancing piston 6, and the latter,- being just slightly largerin diameter than the area of the seat of the valve 10, tends to exert an opening force on the valve 10 or if the pressures be substantially alike allows the action of the operating'means through the connecting link 11 to raise the,

valve 10 to the desired extent permitting steam to flow past said valve and through the openings 19 inthe cage 1 and out through the connection '2.

. It will be observed fromithe above description that the pistono with the throttle 10 and the seat ring 9 and other cooperating parts are all kept in accurate and perfect alignn'ientby havingthem all formed within the same. cast- 1 there being a tight joint between the bear ing, that is, the cage 1 and this casting, being easily removable from the mainthrottle castmg 1, can be taken to a machine and bored or machined as required to get an accurate lit of all the parts, which is important in throttle. valve devices, before thecage1 1s placedin its position in the casting 1. The only machining required to fit the cage 1- to thecasting 1 is the aperture through which the cage 1 is entered and the slight plane bearing surface around such aperture ust inside of the row of bolts 18.

In Figs. 3 and 4 I have shown a somewhat similar arrangement but modified slightly by eliminating the bridge 8 shown in Fig. 1 and substituting a number of shoes or faces 20 supported from the throttle casting 1, the cage 4; being of slightlyaltered construction at the bottom. .It' Will be seen that in the construction shown in Figs. 1 to tinclusive the cage being relatively a small part can be machined With great accuracy and much more easily than handling the usual cumbersome and heavy throttle casting in its entirety. Besides this the parts of the throttle casting Which do'have to be machined are at the upper part of the same Where they are easily reached by machine tools and, therefore, can also be readily machined with great accuracy especially as my improved design permits the use of a larger boring bar than the design in common use.

I claim 1. Throttle valve mechanism comprising in combination a valve casing having an opening therein and supporting means therebeloiv, and a removabe cage slidable into engagement with said opening and said means and positioned thereby at its respective ends, together- With movable valve. parts all mounted in said cage, said parts comprising a main valve seating in the cage, a balancing piston in slidable relation tosaid cage and valve, and a stem carrying a pilot valve and the piston and being slidably mounted in the cage.- e

2. Locomotive throttle mechanism comprising, in combination, a throttle casing, having an opening therein and a guiding and supporting member inside the casing, a removable cage fitted into the opening having a socketed extensionengaging said guiding and support ing member, a main valve, seating on said cage, having an aperture therein, a pilot valve assocated With said aperture and having a stem extending therethrough, said stem slidably engaging said socket, and a balancing 1 piston in the cage, mounted on said stem and slidably engaging saidmain valve. 7 3. Locomotive throttle mechanism comprising, in combination, a throttle casing, having an opening therein and a guiding and supporting member lnslde the casing, a removable cage fitted into the opening having a socketed extension engaging said guiding and supporting member, a main valve, seating on said cage, having an aperture therein, a pilot :valve associated with said aperture and having a stem extending therethrough, said stem slidably engaging said socket, and a balancing piston in the cage, mounted on said stem and adapted, unon opening of the pilot valve,to

bearagainst said main valve.

In testimony hereof, I havehereunto signed my name.

' L. REID. '1' 

